.comment_input{
    width: 300px;
    display: block;
    height: 50px;
    border-radius: 8px;
    margin: 10px auto;
    outline: none;
}
.heihei{
    width: 300px;
    display: block;
    border-radius: 8px;
    margin: 10px auto;
    outline: none;
}